Combined telephone and wireless receiver



Nov. 29, 1927. 1,650,925

C. H. ALLEN COMBNED TELEPHONE AND WIRELESS RECEIVER Filed March l0, 1923It will be readily understood that, when the contact-Wheel is rotatedand owing to its inclined position on t-he shaft, the entire Width ofthe crystal is graduallyv engaged While at the same time the crystal andcup is given a rotary motion Within the sleeve, thereby giving anunlimited number of contact points on the crystal; the contact wheelbeing held in the chosen position by the spring-plate 39.

The pressure ofthe crystal upon the con tact-Wheel is adjusted bypushing'the sleeve 30 in either direct-ion; the elongated aperture 3Bbeing made long;` enough to satisfy the required adjustments. y

lin Fig. l .are indicated also the variousI permanent wiring'connections which are provided Within the aplniratus. The antenna isconnected by means ot a plug contact 4t2 to the terminal A which inVturn is connected to one end of the tuning-coil, and tothe phoneterminal P1 by means ot a wire` connection 43. The pole solenoids areconnected to the tern'iinals l and P2. whereas the sliding contact isconnected to the `ground lterniinal G by the latch-shaped connector 4A,best illustrated in Fig. 3. The connections of the crystal detector withthe sliding contact and pole terminal P2 is etlected by means oit theWires l5 and LG respectively which are preferably embedded in a groove47 cut in the outer circumference ot the insulating ring 20.` v lAlthough my invention may be used by the public in general, it isespecially intended for policemen, taXi-cab drivers and other personsAwho are subject to orders .issued from a central ollice. Assuming thatthe apparatus be used bv a policeman, he Will connect the terminal A toan aerial, which is preferably carried as a coil in his cap, and, theterminal G, to a lire-plug or other-Ymetallic conductor which insures agoed ground connection. lit desired, he may connect a. second telephonereceiver ot the ordinary type to the terminals P and 'P2 in order toreceive the messages through both ears.

Messages Will only be transmitted to lthe policeman at predetern'iinedtimes ot' the day, so that in the intermediate hours he shall be able tostore the instrument away in his pocket While attending to his duties.

The operation oli Wireless receivers operating with crystal detectors istoo Well known to those versed in the art as to require furtherexplanation. Suliice it to say that with crystal detectors now commonlyused, excellent results have been obtained With this apparatiis atdistances as great as thirty miles :trom the sending station.

While l have illustrated and described herein the pre'iferreden'ibodim'ent ot my iuvcntion` and one which I have found by acH tualuse to be very iliractical, it may be thought desirable after continuedexperience to make slight Achanges in the constrl'iction and arrangementot the details ot my inven- 'tion7 and lf intend 'to include in thisapplication all such variations as tall Within the scope of the appendedclaims.

hat I claim is:

l. As an article ot manufacture, the combination of a telephonereceiver; a `Wireless receiving apparatus positioned within saidtelephone receiver and surrounding the poles thereof; said Wirelessreceiver comprising a sleeve member and a tuningl coil; a slidine,rcontact mounted for arcuate movement upon, said tuning coil.; 'flangespositioned at each end et said sleevemembcr and adapted to limit thearcuate movement ot said contact; screu7 operated means for moving saidcontact, and yielding means positioned on said contact adapted to engagethe threads oitj' said screw and to snap over said threads Whensubjected to excessive pressure.

2. In a crystal detector for wireles apparatuses. a crystal; aresilicntvand rotatable support therefor; a. serrated contact disc torsaid crystal and means to rotate said disc; said disc being' obliquelydisposed to said crystal and adapted to gradually sweep over the 'wholewidth thereof and to simultaneously rotate said crystal.

ln testimony whereof l attbi my signature.

CHARLES H. ALLEN.

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